Mishina Gora, Russia

Komatsu, G.; Coletta, Alessandro; Battagliere, Maria Libera; Virelli, Maria

doi:10.1007/978-3-030-05451-9_44

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“…Anomalously negative δ 13 C values in the Segerstad Formation of the Mishina Gora section (Fig. 4) may be related to occasional recrystallization of fractured carbonate rocks followed by the dislocation and deformation of all the sedimentary strata in this Late Palaeozoic circular structure area (Dronov 2004;Komatsu et al 2019). The MDICEK peak cannot be distinguished in the sections within the shallower part of the shelf.…”

Section: Darriwilian Carbon Isotope Stratigraphymentioning

confidence: 99%

Stratigraphy and facies differences of the Middle Darriwilian Isotopic Carbon Excursion (MDICE) in Baltoscandia

Ainsaar¹,

Dronov²,

Kiipli³

et al. 2020

EJES

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it is now known as one of the three major global Ordovician carbon isotopic events (together with the Guttenberg and Hirnantian carbon isotopic excursions). The raised δ 13 C values of the MDICE are covering the middle or upper parts of the Darriwilian Stage, but the amplitude of variation in carbon isotopic values is within the limits of 2‰ in most cases.The chemostratigraphy of the Darriwilian Stage is relatively well studied in the sections of the Baltoscandian Palaeobasin compared to other areas of the world. Carbon isotope data from 18 outcrop and drillcore sections of Estonia, Latvia, Sweden and NW Russia have been published since 2004(Ainsaar et al. 2010 Wu et al. 2017, and references therein). However, the stratigraphic range of the MDICE as a chemostratigraphic unit has been dealt differently (only the peak values or the limbs of the curve included) and the facies variations of the isotopic values have not been studied systematically. In this study, we present new data from ten sections in northern and southern Estonia, western Latvia, Lithuania, NW Russia (Pskov and Leningrad regions) and Sweden (Gotland and Jämtland). Data from Lithuania, Gotland and the Pskov region are first reported from these areas. Comparative analysis of all these isotopic curves helps to evaluate the chemostratigraphic potential of the characteristic intervals of the MDICE, including previous work on the subdivision of the sedimentary succession to isotopic zones (Ainsaar et al. 2010) or different peaks (Lehnert et al. 2014;Wu et al. 2015). This work allows us to track and discuss more 214

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Section: Darriwilian Carbon Isotope Stratigraphymentioning

confidence: 99%